use_raw_strings

Use a raw string to avoid using escapes.

The analyzer produces this diagnostic when a string literal containing escapes, and no interpolations, could be marked as being raw in order to avoid the need for the escapes.

The following code produces this diagnostic because the string contains escaped characters that wouldn't need to be escaped if the string is made a raw string:

var s = 'A string with only \\ and \$';

Mark the string as being raw and remove the unnecessary backslashes:

var s = r'A string with only \ and $';

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